Pipette

Abstract

A pipette comprises a pipette body and a protruding edge, the pipette body is of a hollow tubular structure, the protruding edge is a flat annular protrusion, and the protruding edge and the pipette body are coaxially connected. And the tail end of the tube body is shrunk to form a tip. The tube body is marked with volume marking lines. The protruding edge is located at the position 0.5-1.5 cm away from the upper portion of the volume marking line. And the diameter of the convex edge is 1-2cm. The flat annular convex edge is additionally arranged on the outer wall of a common pipette, when the pipette is placed on the pipette rack, the diameter of the convex edge is larger than the inner diameter of the disc supporting hole in the pipette rack, and the pipette is hung on the pipette rack, so that a sharp nozzle of the pipette is not in contact with a base plate of the pipette rack, and the pipette can be hung on the pipette rack. The pipette tip is prevented from being polluted by dust and dirt on the base plate, and the dirt at the tip of the pipette is prevented from polluting the whole bottle of solution when the tip of the pipette is inserted into the solution to measure the solution, so that the workload of cleaning and rinsing the pipette is reduced, and the experimental result is more accurate and reliable.

Description

Technical Field

[0001] The utility model belongs to the technical field of experimental equipment, and in particular relates to a pipette. Background Art

[0002] A pipette is a measuring glass measuring instrument with graduation lines. It is a common glass instrument used in laboratories in the fields of chemistry, chemical engineering, medicine, environmental protection, etc. There are slight differences between a pipette and a transfer pipette. A pipette can measure solutions of different volumes. Common specifications include 1mL, 2mL, 5mL, 10mL, etc. Transfer pipettes are used to measure solutions of fixed volumes, and the total volume is generally larger than that of pipettes. Common specifications include 5mL, 10mL, 25mL, 50mL, 100mL, etc.

[0003] Nowadays, pipettes have been widely used in various laboratories. However, due to the high price of pipettes, easy damage, high maintenance costs, disposable tips, poor environmental protection and other reasons, many laboratories still use pipettes or tubes to accurately measure solutions.

[0004] Pipette racks are generally used to store pipettes and transfer tubes, so that pipettes and transfer tubes are neatly arranged and easy to take and put. Pipette racks can help laboratory staff to manage and use pipettes and transfer tubes more conveniently.

[0005] There are two main types of pipette racks. One is a trapezoidal horizontal pipette rack, on which the pipette is placed horizontally when in use. The other is a disc-type pipette rack, which has two upper and lower discs, and multiple sets of corresponding support holes are set on the upper and lower discs, which are used to fix the upper and lower ends of the pipette and the pipette, respectively, to prevent the pipette and the pipette from falling off the rack when they are vibrated or collided. Because the disc-type pipette rack has the characteristics of large storage capacity and stable storage, it is widely used in various laboratories.

[0006] The pipette has a bulging belly in the middle. When placed in a disc-type pipette rack, it can be placed on the upper disc support hole, so that the tip of the pipette is suspended through the lower disc support hole. The tip does not touch the bottom plate of the pipette rack and will not be contaminated by dust or dirt on the bottom plate. Unlike pipettes, pipettes do not have a bulging belly in the middle. When the pipette is stored in a disc-type pipette rack, the tip of the pipette will press against the bottom plate of the pipette rack. The dust and dirt on the bottom plate can easily contaminate the tip of the pipette. When the tip of the pipette is inserted into the solution for measuring, the dirt on the tip of the pipette will contaminate the solution. Utility Model Content

[0007] In order to overcome the defects in the prior art, the utility model provides a pipette with a simple structure, which can be hung on a disc-type pipette rack to prevent the tip of the pipette from being contaminated by the bottom plate of the pipette rack.

[0008] To achieve the above object, the technical solution adopted by the present utility model is as follows:

[0009] A pipette comprises a tube body and a flange. The tube body is a hollow tubular structure, and the flange is a flat annular protrusion. The flange and the tube body are connected coaxially.

[0010] Further, the tail end of the tube body shrinks to form a tip.

[0011] Further, the tube body is marked with volume scale lines.

[0012] Further, the flange is located at a position 0.5 - 1.5 cm above the volume scale line.

[0013] Further, the diameter of the flange is 1 - 2 cm.

[0014] Further, the tube body is made of glass.

[0015] Further, the material of the flange includes glass and plastic.

[0016] The present utility model adds a flat annular flange on the outer wall of a general pipette, and the diameter of the flange is 1 - 2 cm. When the pipette is passed through the support holes of the upper disc and the lower disc and placed on the pipette rack, since the diameter of the flange is larger than the diameter of the support hole of the upper disc, the pipette is hung on the upper disc, so that the tip of the pipette does not contact the chassis of the pipette rack, avoiding the contamination of the tip of the pipette by the dust and dirt on the chassis. When a pipette with a contaminated tip is inserted into a solution for measuring the solution, the dirt will enter the solution, causing all the solution to be contaminated and affecting the normal progress of the experiment. Therefore, the pipette proposed by the present utility model can improve the credibility and accuracy of the experimental results and reduce the workload of cleaning and rinsing the pipette.

[0017] For the pipette proposed by the present utility model, the flange is located at a position 0.5 - 1.5 cm above the volume scale line. This design enables the flange not to affect the operation of inserting the pipette into a container with a slender neck such as a volumetric flask for measuring the solution. When measuring the solution, the experimenter places the right thumb and index finger above the flange and near the upper nozzle of the pipette, and holds the pipette to measure the solution. The flange does not affect the experimenter's right hand holding the pipette, nor does it affect the observation of the volume scale line.

[0018] When using the pipette proposed by the present utility model to measure liquid, the operation is the same as that of the existing pipette, and the experimenter does not need special training.

[0019] The beneficial effects of the present utility model are as follows: By adding a flat annular convex edge to the pipette, when the pipette is placed on the pipette stand, the pipette is hung on the upper disc, and the tip of the pipette does not contact the chassis of the pipette stand. This can prevent the tip of the pipette from being contaminated by dust and dirt on the chassis, thereby avoiding the contamination of the entire bottle of solution by the dirt at the tip of the pipette when inserting the tip of the pipette into the solution for measuring the solution. This improves the reliability and accuracy of experimental work and reduces the workload of washing and rinsing the pipette. Description of the Drawings

[0020] Figure 1 It is a schematic structural diagram of a pipette of the present utility model.

[0021] Figure 2 It is a schematic diagram when the present utility model is placed on a disc-type pipette stand.

[0022] Reference numerals in the drawings: tube body - 1, convex edge - 2, volume scale - 3, upper disc - 4, lower disc - 5, upper disc support hole - 6, lower disc support hole - 7, bottom plate - 8. Detailed Embodiment

[0023] To describe in detail the technical content, achieved objectives and effects of the present utility model, the following is described in conjunction with the embodiments and accompanied by the drawings.

[0024] The embodiments of the present utility model do not limit the patent scope of the present utility model. Any equivalent transformation made using the content of the specification and drawings of the present utility model, or directly or indirectly applied in the relevant technical fields, shall be included in the patent protection scope of the present utility model by the same token. Embodiment 1

[0025] (1) Pipette

[0026] A pipette includes a tube body 1 and a convex edge 2. The tube body 1 is a hollow tubular structure, and the convex edge 2 is a flat annular protrusion. The convex edge 2 and the tube body 1 are connected coaxially.

[0027] Further, the tail end of the tube body 1 tapers to form a tip.

[0028] Further, the tube body 1 is marked with a volume scale 3, and the nominal capacity is 1 mL.

[0029] Further, the convex edge 2 is located 1.2 cm above the volume scale 3.

[0030] Further, the diameter of the convex edge 2 is 1 cm.

[0031] Further, the tube body 1 is made of glass.

[0032] Further, the material of the convex edge 2 is glass.

[0033] (2) Measure 1 mL of the solution from the volumetric flask into the conical flask

[0034] (a) Before measuring the solution, first clean the pipette, and then rinse the inner wall of the pipette 2 - 3 times with a small amount of the solution to be measured.

[0035] (b) Place the right thumb and index finger above the convex edge 2, near the mouth of the pipette, and hold the pipette.

[0036] The experimenter holds the pipette between the convex edge 2 and the mouth of the pipette, and the convex edge 2 does not affect the experimenter's holding of the pipette.

[0037] (c) Insert the tip of the pipette into the solution to be measured in the volumetric flask.

[0038] Since the convex edge 2 is located at the upper part of the pipette, it does not affect the operation of inserting the pipette into the volumetric flask.

[0039] (d) Use the rubber bulb to suck the solution to a level slightly above the starting mark 3 of the volume scale, quickly press the mouth of the pipette with the index finger, make the tip of the pipette lean against the inner wall of the mouth of the volumetric flask, reduce the pressure of the index finger, let the solution flow out slowly, and at the same time, look straight at the starting mark. When the lower edge of the meniscus of the solution is tangent to the starting mark, immediately press the index finger tightly.

[0040] Since the convex edge 2 is located above the volume scale 3, it does not affect the observation of the starting mark and the meniscus.

[0041] (e) Tilt the conical flask at 45°, move the pipette into it, make the pipette vertical, and let the tip of the pipette lean against the inner wall of the conical flask, then release the index finger to let the solution flow out freely.

[0042] (f) After all the solution has flowed out, wait for 15 s, and then take out the pipette.

[0043] Using the pipette proposed by the present utility model to measure the solution is consistent with the operation of the existing pipette, and the experimenter does not need special training.

[0044] (3) Place the pipette on the pipette stand

[0045] (a) Wash the pipette.

[0046] (b) First pass the tip of the pipette through the upper disc support hole 6, and then through the lower disc support hole 7 and place it on the pipette stand.

[0047] The pipette stored on the pipette rack has its convex edge 2 placed on the upper disc support hole 6, and the tip of the pipette does not contact the bottom plate 8, which can prevent the tip of the pipette from being contaminated by dust and dirt on the chassis of the pipette rack. When using the pipette next time, it is not necessary to clean the pipette. Instead, it can be directly rinsed with the solution to be measured, which can reduce the workload of the experimental operation and improve the reliability and accuracy of the experimental work. Example 2

[0048] (1)Pipette

[0049] A pipette includes a tube body 1 and a convex edge 2. The tube body 1 is a hollow tubular structure, and the convex edge 2 is a flat annular protrusion. The convex edge 2 and the tube body 1 are connected coaxially.

[0050] Furthermore, the tail end of the tube body 1 tapers to form a tip.

[0051] Furthermore, the tube body 1 is marked with a volume scale line 3, and the nominal capacity is 2 mL.

[0052] Furthermore, the convex edge 2 is located 1.0 cm above the volume scale line 3.

[0053] Furthermore, the diameter of the convex edge 2 is 1.5 cm.

[0054] Furthermore, the tube body 1 is made of glass.

[0055] Furthermore, the convex edge 2 is made of glass.

[0056] (2)Measure 2 mL of solution from the storage bottle into the volumetric flask

[0057] (a)Before measuring the solution, first clean the pipette, and then rinse the inner wall of the pipette 2 - 3 times with a small amount of the solution to be measured.

[0058] (b)Place the finger above the convex edge 2, near the mouth of the pipette, and hold the pipette.

[0059] (c)Insert the tip of the pipette into the solution to be measured in the storage bottle.

[0060] Since the convex edge 2 is located at the upper part of the pipette, it does not affect the operation of inserting the pipette into the storage bottle.

[0061] (d)Use a pipette bulb to suck the solution to a starting mark slightly above the volume scale line 3, quickly press the index finger against the mouth of the pipette, make the tip of the pipette lean against the inner wall of the storage bottle mouth, relieve the pressure of the index finger, let the solution flow out slowly, and at the same time, look straight at the starting mark with the eyes. When the lower edge of the solution meniscus is tangent to the starting mark of the pipette, immediately press the index finger tightly.

[0062] (e)Tilt the volumetric flask at an angle of 45°, insert the pipette into it, keep the pipette vertical, with the tip of the pipette against the inner wall of the weighing bottle, release the index finger, and let the solution flow out freely.

[0063] (f)After all the solution has flowed out, wait for 15 s and then remove the pipette.

[0064] (3)Place the pipette on the pipette stand

[0065] (a)First pass the tip of the pipette through the upper disc support hole 6, and then through the lower disc support hole 7 and place it on the pipette stand.

[0066] (b)When reusing the pipette, remove the pipette from the pipette stand and directly perform the operation of measuring the solution.

[0067] (c)After the experiment is completed, wash the pipette, and then first pass the tip of the pipette through the upper disc support hole 6, and then through the lower disc support hole 7 and place it on the pipette stand.

[0068] For the pipette placed on the pipette stand, the flange 2 of the pipette is placed on the upper disc support hole 6, and the tip of the pipette does not contact the bottom plate 8, which can prevent the tip of the pipette from being contaminated by dust and dirt on the bottom plate of the pipette stand. When repeatedly measuring the solution, there is no need to wash and rinse the pipette, and the operation of measuring the solution can be directly carried out, which can reduce the workload of washing and rinsing the pipette, save experimental time, improve work efficiency, and improve the reliability and accuracy of experimental work. Example 3

[0069] (1)Pipetting

[0070] A pipette includes a tube body 1 and a flange 2. The tube body 1 is a hollow tubular structure, and the flange 2 is a flat annular protrusion. The flange 2 and the tube body 1 are connected coaxially.

[0071] Further, the tail end of the tube body 1 tapers to form a tip.

[0072] Further, the tube body 1 is marked with a volume scale line 3, and the nominal capacity is 5 mL.

[0073] Further, the flange 2 is located 0.7 cm above the volume scale line 3.

[0074] Further, the diameter of the flange 2 is 2 cm.

[0075] Further, the tube body 1 is made of glass.

[0076] Further, the material of the flange 2 is plastic.

[0077] (2)Measure 5 mL of solution from the volumetric flask into the beaker

[0078] (a)Before measuring the solution, first clean the pipette thoroughly, and then rinse the inner wall of the pipette 2 - 3 times with a small amount of the solution to be measured.

[0079] (b)Place the finger above the convex edge 2, near the mouth of the pipette, and hold the pipette.

[0080] (c)Insert the tip of the pipette into the solution to be measured in the volumetric flask.

[0081] (d)Use a pipette bulb to suck the solution to a level slightly above the starting mark of the volume scale 3. Quickly press the index finger against the mouth of the pipette, place the tip of the pipette against the inner wall of the volumetric flask mouth, relieve the pressure of the index finger, let the solution flow out slowly, and at the same time, look straight at the starting mark. When the lower edge of the solution meniscus is tangent to the starting mark of the pipette, immediately press the index finger tightly.

[0082] (e)Tilt the beaker at 45°, insert the pipette into it, keep the pipette vertical, place the tip of the pipette against the inner wall of the beaker, and release the index finger to let the solution flow out freely.

[0083] (f)After all the solution has flowed out, wait for 15 s and then remove the pipette.

[0084] (3)Place the pipette on the pipette stand

[0085] The operation of placing the pipette on the pipette stand is the same as that in Example 1.

Claims

1. A pipette, characterized in that: It includes a tube body (1) and a flange (2). The tube body (1) is a hollow tubular structure, and the flange (2) is a flat annular protrusion. The flange (2) and the tube body (1) are connected coaxially.

2. The pipette according to claim 1, wherein: The tail end of the tube body (1) shrinks to form a tip.

3. A pipette according to claim 1, characterized in that: The tube body (1) is marked with a volume scale line (3).

4. A pipette according to claim 1, characterized in that: The flange (2) is located 0.5 - 1.5 cm above the volume scale line (3).

5. A pipette according to claim 1, characterized in that: The diameter of the flange (2) is 1 - 2 cm.

6. A pipette according to claim 1 or 2 or 3, characterized in that: The tube body (1) is made of glass.

7. A pipette according to claim 1 or 4 or 5, characterized in that: The material of the flange (2) includes glass and plastic.

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